Struct GraphOverlayDelta 

pub struct GraphOverlayDelta { /* private fields */ }

Staged, not-yet-durable graph edges and deletes for one traversal scope.

out_edges/in_edges mirror each other: Self::stage_edge inserts into both so out- and in-neighbour lookups are each O(1) on the node string.

Implementations

impl GraphOverlayDelta

pub fn new() -> Self

An empty overlay.

pub fn stage_edge(&mut self, src: &str, label: &str, dst: &str)

Record a staged edge src -[label]-> dst, indexing it for both out-neighbour (src) and in-neighbour (dst) lookups.

pub fn stage_tombstone(&mut self, src: &str, label: &str, dst: &str)

Record a staged deletion of src -[label]-> dst.

pub fn is_empty(&self) -> bool

True when there is no staged state at all — the caller then takes the durable-only fast path.

pub fn out_neighbors<'a>( &'a self, src: &str, label_filter: Option<&'a str>, ) -> impl Iterator<Item = (&'a str, &'a str)>

Staged out-neighbours of src as (label, dst), honouring label_filter (when Some, only edges with that exact label).

pub fn in_neighbors<'a>( &'a self, dst: &str, label_filter: Option<&'a str>, ) -> impl Iterator<Item = (&'a str, &'a str)>

Staged in-neighbours of dst as (label, src), honouring label_filter (when Some, only edges with that exact label).

pub fn staged_endpoint_names(&self) -> impl Iterator<Item = &str>

Every node name that appears as an endpoint of a staged edge (as a source in out_edges or a destination in in_edges).

A node created purely by an in-transaction edge write has no durable CSR id, so a pattern engine that enumerates free-ranging MATCH anchors from the CSR alone would never admit it. This lets such staged-only nodes be offered as candidate anchors. Names may repeat (a node that is both a staged source and a staged destination); callers dedup as needed.

pub fn is_tombstoned(&self, src: &str, label: &str, dst: &str) -> bool

True when src -[label]-> dst has been staged-deleted.

Trait Implementations

impl Clone for GraphOverlayDelta

fn clone(&self) -> GraphOverlayDelta

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for GraphOverlayDelta

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for GraphOverlayDelta

fn default() -> GraphOverlayDelta

Returns the “default value” for a type.